Power gear mechanism



Nov. 25, 1941. GREG@ 2,263,625`

POWER GEAR MEcHANIsM l Filed Nov'. 24, 1939 2 Sheets-Sheet l Nov. 25, 1941. J, F, GREG@ 2,263,625

POWER GEAR MEGHANISM Filed Nov. 24, 1939 2 Sheets-Sheet 2 patented Nov. 25, 1941 UNITED STATES PATENT .OFFICE POWER GEAR MECHANISM Jonas Floyd Gregg, Mishawaka, Ind.

Application November 24, 1939, Serial No. 305,798

(Cl. I4- 75) 3 Claims.

This invention relates to a power gear mechanism, and particularly to a mechanism of this class for producing both rotary and oscillatory movement.

The particular object of the invention is to provide a power transmission which may be conveniently and compactly combined with an electric motor to form a unitary power gear trans` mission.

Another object is to provide means whereby two speeds of rotary movement and one oscillatory movement may be transmitted from such a unitary power gear transmission.

And a still further object is to provide means whereby two speeds of rotary movement and one oscillatory movement may be transmitted from one end of such a unitary power gear transmission.

Other objects and benefits will be disclosed in the following descriptions and drawings in which:

Fig. l is a cross sectional elevation view of my unitary power gear unit;

Fig. 2 is a sectional plan View of the unit as it would appear on the section lines 2-2 of Fig. l;

Fig. 3 is a sectional plan view as it would appear on the section lines 3-3 of Fig. 1; and

Fig. 4 is an optional structure for part of the mechanism as shown in Fig. 3, as will later be explained.

Now referring to the drawings, and at the outset particularly to Fig. 1, I designate a conventional motor frame by the numeral I and the end bells for the frame by the numerals Il and I2. The end bells are provided with ventilation openings Il' and I2 as shown. Mounted in the end bells is a conventional rotor I3 in proper electrical relation to the stator I4 mounted in the frame I0. The rotor I3 is mounted on a hollow shaft having double extensions I5 and I6. The shaft extensions are mounted in conventional bearings, the extension I5 being mounted in the bearing I9 of the bearing boss II, and the extension I6 being mounted in the bearing 20 of the bearing boss I8. Outside of the bearing 20 the hollow shaft I6- mounts a spur sun pinion 2| affixed to the shaft I6 by the key 22. Mounted in a conventional planetary transmission manner with the sun pinion 2| are two planet gears 23 and 24 held together by an arm 2l having shoulder pin bearings 25 and 26. The planet pinions 23 and 24 mesh in a stationary internal gear 28 held in the bell cap I'I by screws 29.

It will be appreciated that by this structure the rotative movement of the shaft I6 is reduced in speed to rotative movement of the arm 21 by the well known gear laws covering such planetary transmissions.

Integral with the arm 21 is another sun pinion 2l' which in turn meshes with planet gears 30 and 3l mounted on shoulder pin bearings 30 and 3| in an eccentric arm 32.

It will be appreciated that by this structure the reduced speed of the arm 2'I and planet pinion 21' is again reduced by a similar planetary gearing so that the eccentric arm 32 revolves in a doubly reduced speed and, therefore, the high speed of the rotor shaft I6 is greatly reduced in rotary speed for the eccentric arm 32.

The eccentric arm 32 revolves in a bearing 33 inserted in a bell cap 34 mounted on the bell II by the screws 35.

The eccentric of the eccentric arm 32 drives a connecting rod 36 attached to a crank 3l afxed to the shaft 39 by the pin 38 mounted in bearingsk 40 and 4I. As will be appreciated by referring to Fig. 2, the eccentric 32 through the connecting rod 36 and the crank 31 transmits an oscillatory movement to the shaft 39.

Mounted on the bottom of the shaft 39 is another crank 42 iixed to the shaft 39 by the pin 39. This crank 42 carries another connecting rod 44 which is pivoted to the crank 42 by the shoulder pin 43 and to another crank 45 by the shoulder pin 46. By referring to Fig. 3, and noting the variations in the lengths of the cranks 42 and 45, it will be appreciated that increased oscillatory movement is imparted to the crank 45 by reason of the difference in the lengths of the cranks. These differences can be varied at will by the designer to give variations in the oscillation of the shaft 48 to which the crank 45 is attached, and if the desired oscillation of the shaft 48 is above the normal limits of such crank arm transmission, segment gears 5I and 52 may be substituted, as clearly shown in Fig. 4.

The shaft 48 is affixed to the crank 45 by conventional taper key and jam nut means 4l, and, therefore, any movement of the crank 45 is directly transmitted to the shaft 48 which extends through the hollow shaft I6 and emerges at the upper end of my power gear mechanism where it may be attached to any mechanism requiring such oscillatory movement.

Likewise, the hollow shaft extension of the eccentric arm 32 emerges from the top of my power gear transmission, as clearly shown by the drawings, where it is available to transmit slow speed rotary motion, as for example through a V-belt pulley 49 axed to the hollow shaft 32 by the set screw 50.

From the foregoing it will be well understood that I have provided a compact unitary power gear mechanism wherein I am able to transmit two rotary speeds and one oscillatory movement.

Having thus described my invention, I claim:

1. In a power gear mechanism for transmitting rotary and oscillatory motion, a motor having a tubular rotor shaft extending through an end bell, a dual double reduction planetary transmission mounted on said end bell and driven by said rotor shaft, a tubular slow speed ec centric arm shaft extending over said rotor shaft and through said end bell, an eccentric crank ...i

drive driven by said eccentric, and an oscillating drive shaft actuated by said eccentric drive eX- tending through said tubular rotor shaft.

2. In a power gear transmission for simultane- -eccentric drive mounted on the arm of the second epicyclic gear, an oscillating power shaft driven by said eccentric drive, and a slow speed rotary power shaft driven by said second epicyclic gear arm.

J. FLOYD GREGG. 

